Back Bay to Forest Hills

Amtrak Main Line, Boston to New Haven, from (Boston and) Back Bay to
Forest Hills (and New Haven)

From the passenger station with two side platforms
beneath an air-rights building above, with the two side platforms of the Orange
Line alongside to the north, at
Back Bay (MP 227.6), in the "tunnel" formed by the air-rights construction
overhead, the Amtrak line swings south-southwest, CETC, 25 kV overhead
electrification, with speed limit 30 mph, past MP 227.0, where the speed limits
rise to 100 mph for passenger trains and 45 mph for freights, in a trench with
many road bridges overhead where there are gaps in the air-rights construction, the MBTA passenger
station at Ruggles Street (MP 226.5), continuing in a trench with many segments
of "tunnel" formed by air-rights construction, with an MBTA line running to the
west, past crossovers at Plains (MP 224.3), where
freight speeds drop to 20 mph, the MBTA passenger station with platforms on all
tracks at Forest Hills (MP 223.7), "tunnel", a road bridge overhead, and the junction at Forest (MP 223.5),
where freight speed revert to 45 mph, the Main Line turns south and the Needham
Branch turns away southwest.